Once more, thanks for your replies.
@Joe windsurf - I try to stick to the old rule, weight +20, to ensure enough volume under my feet. I have and older 88L slalom board, but I can count the times I have used for the last ten years in one hand. +30kts. If you going to pull the rig instead of water start, and a wetsuit. then weight +30, then its all about the technique. Bigger camsails are a tough to handle in water ;-)
@forceten - Agree, 12 knots feel almost impossible. +18kts=JP. :-)
I have tried free ride boards before and the are "nice", but when Im planning its all about speed. :-)
Budget, well Im not on a shoestring budget, but would never spend my money on a new board, Im not that eager to have the latest. I have seen guys with 3 year old sails and board to perform well in races.
@olskool - I just started to snoop around here, but I think I found the thread that you mentioned. This question was similar to mine (maybe should have used the search function better). Your profile popped up in a regrip thread. How did that go? I have just stripped my race boom and looking for options to build a nice hump, then I will cover it with rubberized cork. Will see how that turns out. I must regrip my other boom, but I will wait for the result.
I will try to get a demo of a LW board and take it from there. Hopefully some discounts starts soon when the 2019 boards are arriving. Most of the 2018 LW slalom are foil ready. Then Im prepared for the future? :-)
If that doesn't feel right or match my budget, next step would probably be a tryout between different slalom boards in the 140L range.
As for the SB Phantom, its a safe bet. Not as lively or versatile as slalom board, but that would be my absolute last resort if can't decide.